//datetime 格式为2019-11-22 12:23:59样式
const time = {
	timeago: function(datetime) {
		const changedateyear = new Date(datetime).getFullYear();
		const changedatemonth = `${new Date(datetime).getMonth()+1}`.padStart(2, 0);
		const changedateday = `${new Date(datetime).getDate()}`.padStart(2, 0);
		const changedatehour = `${new Date(datetime).getHours()}`.padStart(2, 0);
		const changedateminute = `${new Date(datetime).getMinutes()}`.padStart(2, 0);
		const changedates = `${new Date(datetime).getSeconds()}`.padStart(2, 0);
		const newchangedate = `${changedateyear}-${changedatemonth}-${changedateday} ${changedatehour}:${changedateminute}:${changedates}`
		var dateTimeStamp = new Date(newchangedate.replace(/ /, 'T')).getTime(); //这里要减去中国的时区8小时
		var minute = 1000 * 60; //把分，时，天，周，半个月，一个月用毫秒表示
		var hour = minute * 60;
		var day = hour * 24;
		var week = day * 7;
		var halfamonth = day * 15;
		var month = day * 30;
		var now = new Date().getTime(); //获取当前时间毫秒
		var diffValue = now - dateTimeStamp; //时间差

		if (diffValue < 0) {
			console.log("diffValue<0", datetime, dateTimeStamp, now, diffValue);
			return '刚刚';
		}
		var minC = diffValue / minute; //计算时间差的分，时，天，周，月
		var hourC = diffValue / hour;
		var dayC = diffValue / day;
		var weekC = diffValue / week;
		var monthC = diffValue / month;
		var result = "2";
		if (monthC >= 1 && monthC <= 3) {
			result = " " + parseInt(monthC) + "月前"
		} else if (weekC >= 1 && weekC <= 3) {
			result = " " + parseInt(weekC) + "周前"
		} else if (dayC >= 1 && dayC <= 6) {
			result = " " + parseInt(dayC) + "天前"
		} else if (hourC >= 1 && hourC <= 23) {
			result = " " + parseInt(hourC) + "小时前"
		} else if (minC >= 1 && minC <= 59) {
			result = " " + parseInt(minC) + "分钟前"
		} else if (diffValue >= 0 && diffValue <= minute) {
			result = "刚刚"
		} else {
			var datetime = new Date();
			datetime.setTime(dateTimeStamp);
			var Nyear = datetime.getFullYear(); {}
			var Nmonth = datetime.getMonth() + 1 < 10 ? "0" + (datetime.getMonth() + 1) : datetime.getMonth() + 1;
			var Ndate = datetime.getDate() < 10 ? "0" + datetime.getDate() : datetime.getDate();
			var Nhour = datetime.getHours() < 10 ? "0" + datetime.getHours() : datetime.getHours();
			var Nminute = datetime.getMinutes() < 10 ? "0" + datetime.getMinutes() : datetime.getMinutes();
			var Nsecond = datetime.getSeconds() < 10 ? "0" + datetime.getSeconds() : datetime.getSeconds();
			result = Nyear + "-" + Nmonth + "-" + Ndate
		}
		return result;
	}
}

export default time
